EP0700176A3 - Optical emitter for transmitting an intensity and phase modulated light beam - Google Patents

Optical emitter for transmitting an intensity and phase modulated light beam Download PDF

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Publication number
EP0700176A3
EP0700176A3 EP95113134A EP95113134A EP0700176A3 EP 0700176 A3 EP0700176 A3 EP 0700176A3 EP 95113134 A EP95113134 A EP 95113134A EP 95113134 A EP95113134 A EP 95113134A EP 0700176 A3 EP0700176 A3 EP 0700176A3
Authority
EP
European Patent Office
Prior art keywords
lasers
coupler
beams
control circuit
optical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP95113134A
Other languages
German (de)
French (fr)
Other versions
EP0700176A2 (en
Inventor
Yu Dr. Ing. Wang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ascom Tech AG
Original Assignee
Ascom Tech AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Ascom Tech AG filed Critical Ascom Tech AG
Publication of EP0700176A2 publication Critical patent/EP0700176A2/en
Publication of EP0700176A3 publication Critical patent/EP0700176A3/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier

Abstract

Der optische Sender (3) dient zum Aussenden eines Lichtstrahls A, der ein periodisches Hilfsträgersignal aufweist, welches durch ein Nutzsignal (NS) phasenwinkel- oder frequenzmoduliert ist. Der Sender (3) umfasst zwei Laser (10, 11), zwei Strahlteiler (12, 13), zwei Strahlkoppler (15, 16), einen Lichtmodulator (14), eine ringförmige Optikfaser (18) und optische Verbindungen zum Verbinden dieser Einheiten. Hierzu kommen mit Vorteil ein oder zwei Polarisationsüberwacher (21, 23), und ein Regelkreis aus einem weiteren Strahlkoppler (25), einer Fotodiode (27) und einer Steuerschaltung (28) zur Regelung der Laser (10, 11). Die von den Lasern (10, 11) abgegebenen Lichtstrahlen (L1, L2) werden durch die Strahlteiler (12, 13) geteilt. Die Hauptstrahlen (L1, L2) laufen über den ersten Strahlkoppler (15) gegensinnig in die Optikfaser (18) ein und erzeugen in dieser durch stimulierte Brillouin-Streuung rücklaufende Lichtstrahlen (L5, L6) leicht veränderter Frequenz. Der eine rücklaufende Strahl (L5) durchläuft den Modulator (14) und wird in diesem phasenmoduliert. Danach vereinigen sich die rücklaufenden Strahlen (L5, L6) im zweiten Koppler (16) und ergeben den Ausgangsstrahl A. Die Nebenstrahlen (L3, L4) der Strahlteiler (12, 13) vereinigen sich im weiteren Koppler (25) und werden durch die Fotodiode (27) in einen Strom umgewandelt. Dieser erzeugt in der Steuerschaltung (28) ein Regelsignal, durch das die Differenz der optischen Frequenzen der beiden Laser (10, 11) stabilisiert wird.

Figure 00000001
The optical transmitter (3) is used to emit a light beam A which has a periodic subcarrier signal which is phase-angle or frequency modulated by a useful signal (NS). The transmitter (3) comprises two lasers (10, 11), two beam splitters (12, 13), two beam couplers (15, 16), a light modulator (14), an annular optical fiber (18) and optical connections for connecting these units. For this purpose, one or two polarization monitors (21, 23) and a control circuit comprising a further beam coupler (25), a photodiode (27) and a control circuit (28) for regulating the lasers (10, 11) are advantageous. The light beams (L1, L2) emitted by the lasers (10, 11) are divided by the beam splitters (12, 13). The main beams (L1, L2) run in opposite directions into the optical fiber (18) via the first beam coupler (15) and generate light beams (L5, L6) with a slightly changed frequency in the latter, which are returned by stimulated Brillouin scattering. The one returning beam (L5) passes through the modulator (14) and is phase-modulated in it. The return beams (L5, L6) then combine in the second coupler (16) and produce the output beam A. The secondary beams (L3, L4) of the beam splitters (12, 13) combine in the further coupler (25) and are generated by the photodiode (27) converted into a stream. This generates a control signal in the control circuit (28), by means of which the difference in the optical frequencies of the two lasers (10, 11) is stabilized.
Figure 00000001
EP95113134A 1994-08-29 1995-08-22 Optical emitter for transmitting an intensity and phase modulated light beam Withdrawn EP0700176A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH264494 1994-08-29
CH2644/94 1994-08-29

Publications (2)

Publication Number Publication Date
EP0700176A2 EP0700176A2 (en) 1996-03-06
EP0700176A3 true EP0700176A3 (en) 1998-04-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP95113134A Withdrawn EP0700176A3 (en) 1994-08-29 1995-08-22 Optical emitter for transmitting an intensity and phase modulated light beam

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2677112C1 (en) * 2018-01-29 2019-01-15 Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" (Госкорпорация "Росатом") Optical transmitter

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62287229A (en) * 1986-06-05 1987-12-14 Fujitsu Ltd Light intensity modulation system
US4893352A (en) * 1987-06-30 1990-01-09 Massachusetts Institute Of Technology Optical transmitter of modulated signals

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0633672A1 (en) 1993-07-08 1995-01-11 Ascom Tech Ag Optical transmitter for transmitting intensity and phase modulated light beams

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62287229A (en) * 1986-06-05 1987-12-14 Fujitsu Ltd Light intensity modulation system
US4893352A (en) * 1987-06-30 1990-01-09 Massachusetts Institute Of Technology Optical transmitter of modulated signals

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CULVERHOUSE D ET AL: "STIMULATED BRILLOUIN SCATTERING RING RESONATOR LASER FOR SBS GAIN STUDIES AND MICROWAVE GENERATION", ELECTRONICS LETTERS, vol. 27, no. 22, 24 October 1991 (1991-10-24), pages 2033 - 2035, XP000265995 *
PATENT ABSTRACTS OF JAPAN vol. 012, no. 175 (P - 707) 25 May 1988 (1988-05-25) *

Also Published As

Publication number Publication date
EP0700176A2 (en) 1996-03-06

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